MT-250X - GSM Data Protocol Analyser

The MT-250X GSM Data Protocol Analyser is designed for testing the A- and Abis interfaces, as well as the MSC/IWU interface, for systems including Phase 2 (HSCSD). It has many features that makes it an effective time saving test tool for testing data, fax and speech and relevant ISDN protocols.

Using protocol analysis for fast fault finding

  • Monitoring of "live" lines without affecting the network.
  • Protocols can be decoded and studied at the desired layer; for optimum fault finding
Control pane of the MT-250X

User friendly, easy to learn, and flexible

  • In order to simplify the configuration of the equipment, SS7 signalling support can be included, which allows trigging on protocol traffic with automatic unit configuration.
  • Two receivers and one transmitter (simultaneously) enable effective monitoring.
  • Support for verification of correct voice transmissions.
  • Timeslot monitoring of the complete data stream.
  • PC based and X-Window screen handling.
  • PC or portable solution for distributed test setup

MT-250X Features

The standard system comprises an industrial PC running the Linux operating system and X-Window system, one interface card supporting dual channel monitoring and a basic software package. An additional interface card may be added for dual mode operation.

Protocol support

  • A Interface Protocol support: Analysis of ITU-T V110 Phase 1,",2+ transparent and non-transparent services (GSM 04.21) RLP ( GSM 04.2 ) and L2R COP/BOP ( GSM 07.02/0.3 ) include Phase 2+ HSCSD with Multilink RLP Functions version 0,1, and 2 and ATRAU (GSM08.20) Transparent and Non Transparent.
  • Abis Interface Protocol support: Full Rate TRAU and Enhanced Full Rate TRAU ( GSM 08.60 ) and Half Rate TRAU. E-TRAU are also supported ( GSM 08.60 ) in Transparent and Nontransparent and GSM signalling.
  • All protocols in A Interface can be viewed in Abis interface.
  • Fax transmission over V.110 and A-TRAU, speeds up to14.4 kbps.GSM 03.45, T.30 and T.4 analysis and fax picture.
  • UMTS E-Interface ( GSM 29.007): Phase 2+ are supported up to 56kbps for the 08.20 Tr./Non Transparent.
  • PPP (IP, TCP, UDP, ICMP) means PPP over GSM (V.110, A-TRAU, E-TRAU) and PPP over ITU-T
  • SS7: Auto-configuration, Finding timeslot, calling no and decoding of MTP2,MTP3,SCCP, BSSMAP, DTAP, SMS etc ISDN PRI D-Channel Analysis.

Speech Testing

Full Rate, Enhanced Full Rate and Half Rate Speech codec (06.10). This enables the test and verification of both the quality of the speech and the delay incurred by the switch(es) measured on the A- and Abis interfaces. Both A-law and ยต-law are supported in addition to raw 8-bit unsigned PCM and listen to speech.


SM 08.62 TFO, GSM 08.60 Trancoder and rate adapters for EFR,FR, GSM 08.61 Transcoder and Rate adapter for HR, GSM 06.10 FR Codec, GSM 06.20 HR Codec, GSM 06.60 EFR Codec.


Our SS7 functionality has been developed to assist the user in configuring the MT-250X for the reception of data/fax and speech calls. The automatic traffic channel configuration is based on SS7 signalling on the A-interface in the GSM network. One interface card is connected to the line(s) carrying the data traffic. A second card continuously monitors the signalling and enables the unit to automatically set the traffic channel timeslot and protocol when the desired call is set up. A number of trigger options are available, including called or calling party phone number.

Triggers and filters

This feature allows the user to start file captures, monitoring sessions or initiate simulation scripts execution using a trigger. The different trigger types available are:

Timeslot monitor

The timeslot monitoring option allows continuous analysis of the type of traffic present on the different timeslots on the line at any given time. It does not rely on any external signalling information and distinguishes between the various data protocols (e.g. TRAU, GSM V110-(Non)Transparent, ISDN V110 ..) in addition to the data rates. Furthermore, the received information may be used to automatically set the basic protocol level, switch to the timeslot where traffic is present and commence monitoring and capture to file.

Quality of Service verification

Test reports can be generated automatically by the system to give a general health check of the equipment being tested. The test report will contain the number of received packets, CRC errors, etc..

Remote operation

The MT-250X can be remotely operated from a PC or UNIX workstation

Its small size makes it THE portable test solution.